Apparatus for molding.



PATENTED AUG. 11, 1908.

T. H. SYMINGTON. APPARATUS FOR MOLDING.

APPLICATION FILED APB. 13,1907.

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wane/aces y QM UNITED STATES PATENT OFFICE.

THOMAS H. SYMINGTON, OF BALTIMORE, MARYLAND, ASSIGNOR TO THE T. H.SYMINGTON COMPANY, OF BALTIMORE, MARYLAND, A CORPORATION OF MAINE.

APPARATUS FOR MOLDING.

Specification of Letters Patent.

Patented Aug. 11, 1908.

To all whom it may concern:

Be it. known that I, THoMAs H. SYMING- TON, citizen of the United Statesof America, and resident of the city of Baltimore, State of Maryland,have invented certain new and useful Improvements in Apparatus forMolding, of which the following is a specification.

The present invention relates to a molding machine and more particularlyto that type of molding machine in which'the pattern is stripped as itis withdrawn from the sand.

Stripping plates broadly are not new. A molding machine provided with astationary stripping plate through which the pattern is lowered from theflask, after the sand has been rammed in, is in use in the art. Thedisadvantage of this machine is, that as the pattern is lowered from theflask, the sand which forms the interior of the mold is un supported andfrequently parts of it are displaced, injuring or destroying the work.The turnover machine has not previously been provided with a strippingplate. It is common practice to provide a pattern plate which ispivotally mounted and to which the pattern is secured.

In the operation of this machine the pattern plate is first rotateduntil the pattern is in an upright position above the plate; it is theninclosed by the flask, which is clamped in position; the sand is rammedhome, a bottom plate placed over it and clamped to the flask. Thepattern plate is then rotated in its bearings, carrying with it thepattern, flask and mold'until the flask hangs above a table, which israised by any convenient means, as hydraulic or air pistons, to receiveit. The clamps which hold the flask to the pattern plate are thenremoved, and the flask containing the mold is lowered. The pattern isthus removed from the mold, and remains in position for the operation tobe repeated.

The subject matter of this invention consists in the provision in aturnover molding machine of a stripping plate, and various details andcombinations of parts relating there- 'to, and the method of molding bywhich the attern is strip ed as it is removed from the flask, the flaskeing maintained during the operation in such a position that the sanddoes not tend to be displaced by force of gravity.

It is also within the scope of my invention to raise the pattern throughthe stripping plate as it is removed from the mold. The

desired end to be attained by my improvement is, that the pattern isremoved from the mold and stripped while the mold is in such a positionthat the sand is not easily dis placed, and also in a position which isconvenient for pouring or removal to a distant place of pouring.

In the accompanying drawings,Figure 1 is a front elevation of a moldingmachine in connection with my invention as shown and described. The moldand flask are partly removed from engagement with the pattern. Fig. 2 isan end elevation of the machine in the same position. Fig. 3 is a frontelevation of the machine in position to receive the molding material.

I have described and shown a machine in connection with which myinvention has been used, but which is not necessary to its operation.The stripping plate and method of molding herein set forth may beemployed in connection with various turnover molding machines.

The illustration comprises a pattern plate (1) provided with journals(2) supported in bearings (3) mounted in the uprights (4) of a suitableframe. A means, not shown, is provided whereby the pattern plate may berotated in its bearings. A table (5) adapted to be raised and lowered bymeans of pistons (6) actuated by hydraulic or air pressure, supports atcertain periods of the operation the flask (7). A pattern (8) istemporarily secured to the pattern plate by any convenient means as tobolts (9). A stripping plate (10), the opening in which conforms to thelargest horizontal cross section of the pattern is shown in Figs. 1 and2 resting on the mouth of the flask.

The method of molding contemplated by the invention is as follows: Thepattern plate to which the pattern is attached is first rotated untilthe latter is in position above the pattern plate; the pattern is thenencompassed by the stripping plate, which rests on the pattern plate,and the flask is then positioned in relation to the stripping plate bymeans of lugs (11) thereon, which are bored to receive the pins (12) ofthe stripping plate and clamped to the pattern plate by means of theusual clamps, not shown. The flask incloses the pattern laterally. Thesand is next rammed into place about the pattern, and a bottom board(13) is placed thereon and clamped to the flask. The pattern platecarrying stripping plate, flask, pattern, and mold, is then rotatedthrough an arc of approximately 180 degrees until the flask is suspendedover the table (5), which is then raised until its surface is inengagement with the bottom board. The clamps which hold the flask to thepattern plate are then removed, and the mold contained in the flask, ontop of which rests the stripping plate, is lowered, the pattern beingwithdrawn through the stripping plate and thereby stripped.

The method and means of molding contemplated by the invention have beenherein described specifically, and in detail, but the invention is notlimited to the details described but oonsists broadly in the method andmeans for molding by which the pattern is stripped as it is removed fromthe flask, the flask being maintained during this operation in such aposition that the sand does not upward through the stripping plate,causing the stripping mechanism to operate while the mold is in uprightposition.

Signed by me at Baltimore, this of March, 1907.

THOMAS H. SYMINGTON. Witnesses:

J. MERGER GARNETT, Jr., E. JOHN NICHOLS.

28th day

